Tomography options need serialization

[coruscating]

What is the current behavior?

When trying to save a tomography experiment to ResultsDB,

import qiskit_experiments.tomography as tomo
import qiskit.quantum_info as qi
target = qi.random_statevector(2 ** 1, seed=0)
qstexp = tomo.StateTomography(target)
expdata = qstexp.run(backend)
exp_data.block_for_results()
expdata.save_all()

the error is:

Object of type PauliMeasurementBasis is not JSON serializable

We need to decide how to serialize PauliMeasurementBasis.

[chriseclectic]

I think @jyu00 has fixed in #115, can you test on the latest update?

[coruscating]

Yes, this has been fixed, but the graph isn't getting uploaded. The error when saving is {"errors":["Invalid content-type: multipart/form-data; boundary=6bacea2081aa1b095503a7821fe62e8c; expected multipart/form-data"]}